Stop motion for yarn-twisting machines



pril 3, 1928. Y 1,665,006

J. wYss STOP MOTION FOR YARN TWISTING MACHINES n Filed April 29 1927 2 ShegtS-Shee. 2

IN VE N TOR JIM /1/5 W/S By/M me@ A TTOHNEYS Patented Apr. 3, 19?..8.k

UNITED. STATES rasante .PATENT clerics.

JULIUS Wyss, or WATERTOWN, Massnoirnsnrrs, Assreraon To New ENGLAND sPUN srLK CORPORATION, or NEWYORK, N. Y., A consonATroN or ivressAOnUsnTTs.

STOP MOTION FOR YRN-TWISTING MACHINES.

Application led April 29, 1927. Serial No. 187,453.

ends, these occurring when yarns being twisted become broken and tanglewith the twisted yarns which lare being wound upon next adjacent bobbins. v

Another object isto so construct the yarn gripping means'of the stop motion device that when said means is engaged with the yarns, following a break therein, it will cause the severance of the yarns at a point between the feeding spools and `delivery rolls to permit clearing of the `detached ends by the action of said `rolls and will, at the same time, hold the extremities of the yarns in such manner that when the operator removes the same from said means, preparatory to again feeding the yarns between the delivery rolls, said extremities will readily become detached from the gripping means without leaving line short strands of the material therein.

The above and other objects will appear more clearly from the following detail description, when taken in connection with the accompanying drawings, which illustrate a preferred embodiment of the inventive idea.

In the drawings* Figure l is a fragmentary transverse sectional view taken through a yarn twisting machine and showing one of the improved stop motion devices applied thereto;

Figure 2 is a fragmentary top plan view of the machine, illustrating two of the stop motion devices each associated with one of the yarn delivery mechanisms of the machine;

Figure 3 is an end elevation of proved stop motion device;

Figure l is a fragmentary plan view thereof; Y

Figure 5 is a section on the line 5-5 of Figure 3, showing the gripping means in operative position; v

Figure 6 is a view similar to Figure 5, showing the gripping means of the stop motion device in its inoperative position, this position being taken only when extremities the i mof the yarns are beingdetached therefrom, following a break in the yarns between the delivery rolls and the spindle upon which the twisted yarns are being wound; and

' Figure 7 is an elevational view of the end of the stop motion device opposite that shown in Figure 3. l f

The twisting machine partially illustrated vin the accompanying drawings is of a well known construction wherein the framethereof, generally indicated by the numeral l0 is 4of considerable length so as to provide for the simultaneous operation of a battery of spindles 1l supported and driven in the lcustomary manner to wind the yarns thereon and effect the twisting thereof between the spindles and the delivery rolls. In

Atwisting frames rof the usual construction there are provided one or two lower delivery rolls l2 which extend the entire length of .he machine and are therefore common to all of the spindles. Supported above and in engagement with the delivery roll or rolls l2 are a plurality of top rolls leach individual to one spindle and with each of which there isf associated one of the stop motion devices comprising the essential features of the present invention, At the rear of the lframe l() there is provided an upright le upon which are mounted a vplurality of yarn l .carrying spools or rolls l5 onlyone of which vis shown in the present illustration. Assuming, for purposes of the present description, that a thread 1s to be made up and wound `upon the bobbin 11 by twisting two lengths of yarn, these lengt-hsl are fed from the spools 15 in parallel or untwisted relation and: extended around a .guidey rod 16 arrlhe ranged lengthwise of the machine. yarns then are passed to andfbetween the de,- livery rolls l2 and 13 which are operated in the usual manner to draw the yarns vfrom the spools, From the rolls the yarns are wound upon the spindle 1l and the twisting action applied to the yarns takes plac between; said rolls and thev spindle. lt is'vbetween .these points that the yarns break and, due to the whirling action impartedto the yarns durwill very -often become tangled with the yarns being wound upon next adjacent spin- .dles on opposite sides of the spindle 1l causing what is known as double ends. It is for the purpose of preventing these double ends that the stop `motion devices are pro- Ving the twisting operation, the broken ends..`

vided and each ofthese devices operate, upon the breaking of the yarns withwhich it is associated, to stop the further feeding of the yarns to the delivery rolls, the operation which continue after the break. Y i @ne ofthe stop motion devices and its operation will now be described in detail. A bearingl block17 is secured to 'a suitable i part ofthe framework of the machine above l() the delivery rolls 12, such as the support 18 for the top roll 13. An arm 19 is pivotally mounted, intermediate its ends, in the block 17 for rocking ii'iovement therein witlione end of the arni disposed upon the inlet side of the delivery rolls :indits opposite. end

:disposed `upon the outlet side thereof, the

downward movement of the first named end beingl limited by Contact with the inclined edgi'e Qd of said block, as illustrated in dotted lines in Figure 1. The second named end ot the arm `19 is pi'ovidcd with a deiendinO' oii'set extensionQl which terminates i at its free,extremity in a laterally projecting hook 22 through which'pass the yarns to be twisted. vThe tension 'applied to the yarns as they are being drawn on to the spindle 11 `and the consequent downward pullupon the outer end `of the arm 19 `-is sutlicient to maintain said arm in its normally inoperative .position shownr in full linesl in Figure vl. However, should the yarns become broken between the hook 2Q and thc spindle 11, this tension is relieved and the arm 19, being' slightly heavier on the opposite side of its pivot from the hook will immediately rock aboutsaid'pivot to the dotted line position with the result that the yarns which normally pass freely beneath the gripping means of the device,

as shown in Figure 3, will be engagedby said means to cause a severance of the yarns at this point. This severing action is diie to the continued pull Vexerted by the delivery rolls upon those portions of the yarns which are at the time ofthe break passing between said rolls. Said portions, which will Valways be of comparatively short length thus reducing the waste to aniinimum, will be drawn' between'the rolls andlibe `either wound upon the roll 13 or thrown off `the rolls by the rapid rotation thereof. i i

'llic griliping means at the inner end of the arin 19 comprises a stationary plate 23 extending laterally from the arni and"adjustably means ofa small bolt `24 extending through a slot 25 in said arm, The plate 2h andlthe remainder ofv the `parts associated therewi't'ht are disposed diagonally relative to' the arm and at such an inclinationtliat theV ping means will at alltimes'be incline "'upwardlyand forwardlytoward the fronto'f the Vmachine for a purpose which- `will presentlyappear.` The upper edgeof the plate`23fisprovided with aboss 26 having a secured lengthwise thereof by transverse opening therethrough for receiving one end of an angular rod'2'i' adjustably secured in said boss by means of a screw 28. The opposite end of the Vrod 27. is utilized as a pivot for a movable gripping plate 29 whiclrcooperateswith the plate to grip the yarns tlierwebet-ween when thc arin 19 isV inV its operated position. The plate 23 is providedwith a beveled gripping surface BOwh'ich is adapted tobev engaged by the gripping edge or surface 31 ofthe plate 29, as shown in Figure 5g when the latter plate is in its normal position.- This normal position of the plate 29 is assumed at all times except when the extremities of the yarnsl held between said plates are beingl withdrawn ftlierelfroin tliollowing the sever-V ance ofthe yarns at the point of' engage ment ot the gripping means therewith and this normalengagement of the Vsurfaces El() and 31 is due to thefinclination of the plates" with respect vto the arini19,` Thus when the inner end ofthe arm 19 falls, by reason of Y a. break in the yarns, thegripping means comprising the plates QB'and -29 have'their gripping surfaces in contacting relation and lwill "consequently engage the'yarns as the latter pass `into the relentraiit slot 32 spools 15 will new be licldbetween thegrippingsurfaces and an operator upon observinga break will then ,detach said extremitiesV from the gripping means preparatory -to again feedingthe yarnsbetwecn the .de-

livery rolls and to the spindle.Y In` withdrawing theextremities of 4the yarns from the gripping device, it ishighly desirable that no short strands thereof beleft between the gripping Vsurfaces and it 'is' in aiiily i for this purpose that the plate 29 is pivotally mounted so thatwhenairarwaiid'pull is exerted upon the yarns said plate `29 will swing rearwardly about its pivot and thus i disengage the surface or edge thereof from the beveled surface 3() of the lplate i2?),"the rearward movement of said platel 29 being limited by a stop 33l carried by the'plate 23,

as illustrated in Figure 6. It will. be seen from the latterligure-tliat the movei'ii'entof the plate 29 totally disengagesV the two` gripping surfaces and consequently the with# drawal of the'eirtr'emities of the yarns therec from notleave Tanyofthestrands thereof caughtfbetween surfaces'.v As soon gripping surface cooperating witlrthe sur`r face of the stationary plate and normally engaged therewith to receive the yarns therebetween to cause said VyarnsV to be severed, and said movable plate being. movable about its pivot to disengage said surfaces to thereby release the severed yarns. i

6. In yarn twisting mechanism, the coinbination of feeding means for the yarn and ,delivery rolls to which lthe yarn is fed, ad-

justable means to guide the yarn in' one direction from said feeding means to said rolls, a stop motion device movable to a position to engage'the yarn for severing the same,and means for adjusting saidfguiding means to alter the direction of rfeed of the yarn to said'rolls to prevent engagement of the` yarns by said device `whenithe latter moves to its severing position.

7. In yarn twisting mechanism, the com bination `with a frame, delivery rolls snpported therein, a bearing member carried by the frame above said rolls, feedingrmeans from which yarn is drawn to `said rolls, and a bobbin for receivingr said yarnfr'om said rolls of ,a stop motion device including an arm pivoted for rocking movement in said Leganes bearingfabove said rolls,means for guiding said yarn from said feeding means tosad rolls with the yainextending entirely `bef heath said arm, and inea-ns on said arm oper;` able by movement thereof in one direction about its pivot tof engage and grip the yarn at a point between said feeding means and delivery rolls to cause said'yarn tobe severed at said point by the action of said rolls.

8. A stop motion device foi use with yarn twisting mechanism including a pivoted arm, vgripping means carried by said arm and operablenpon movement thereof in vone direction to engage the yarn to prevent furf ther feed-ing thereof to the twisting mech-v anism,said gripping. means including a stationary gripping surface, and a second surface pivotally movable relative to the .first named surface to contact and move away therefrom whereby to `grip the yarn there between. and permit release thereof;

. 9. A stop motion device for usewithfyarn twisting mechanism including a pivoted arm Y held against movement the yarn being twisted, gripping means carried Yby-` said arm and operable upon release thereofbythe yarn and consequent inovementof the arm" about its pivot toengage said yarn to prevent further feedingthereof to the twisting mechanism, said Vgripping means including fr plates having opposed gripping edges bef` tween whichv the'lyarn is held when said grip-- ping means is operated, and aV mountingfor one vof said plates permitting movement thereof relativeto the otherplate to sepa rate said gripping edges.

In testimony `whereof I" have aliixedmy signature.

f JULiUs wYss. 

